1965 Valiant + Gen 3- 6.4 Hemi

Hello everyone. I know this post might not be for everyone seeing as I'm putting a Gen 3 in a a body. I understand purests and I'm not here to cause anyou stir ups. Just looking for a little help. I will be putting a new tubular k member in the car soon. Anyone have suggestions on who's to use? Also, if anyone's done this swap before can you please give me advice on what headers you are using? Looking at long tubes, but need to make them fit. I figure this will be a custom job. Thanks for any and all help!